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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/scripts/faddr2line
....@@ -44,17 +44,6 @@
4444 set -o errexit
4545 set -o nounset
4646 
47
-READELF="${CROSS_COMPILE:-}readelf"
48
-ADDR2LINE="${CROSS_COMPILE:-}addr2line"
49
-SIZE="${CROSS_COMPILE:-}size"
50
-NM="${CROSS_COMPILE:-}nm"
51
-
52
-command -v awk >/dev/null 2>&1 || die "awk isn't installed"
53
-command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"
54
-command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed"
55
-command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"
56
-command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"
57
-
5847 usage() {
5948 	echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
6049 	exit 1
....@@ -69,14 +58,23 @@
6958 	exit 1
7059 }
7160 
61
+READELF="${CROSS_COMPILE:-}readelf"
62
+ADDR2LINE="${CROSS_COMPILE:-}addr2line"
63
+AWK="awk"
64
+
65
+command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed"
66
+command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed"
67
+command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed"
68
+
7269 # Try to figure out the source directory prefix so we can remove it from the
7370 # addr2line output.  HACK ALERT: This assumes that start_kernel() is in
74
-# kernel/init.c!  This only works for vmlinux.  Otherwise it falls back to
71
+# init/main.c!  This only works for vmlinux.  Otherwise it falls back to
7572 # printing the absolute path.
7673 find_dir_prefix() {
7774 	local objfile=$1
7875 
79
-	local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
76
+	local start_kernel_addr=$(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' |
77
+		${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')
8078 	[[ -z $start_kernel_addr ]] && return
8179 
8280 	local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
....@@ -97,86 +95,158 @@
9795 	local dir_prefix=$3
9896 	local print_warnings=$4
9997 
100
-	local func=${func_addr%+*}
101
-	local offset=${func_addr#*+}
102
-	offset=${offset%/*}
103
-	local size=
104
-	[[ $func_addr =~ "/" ]] && size=${func_addr#*/}
98
+	local sym_name=${func_addr%+*}
99
+	local func_offset=${func_addr#*+}
100
+	func_offset=${func_offset%/*}
101
+	local user_size=
102
+	local file_type
103
+	local is_vmlinux=0
104
+	[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/}
105105 
106
-	if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then
106
+	if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then
107107 		warn "bad func+offset $func_addr"
108108 		DONE=1
109109 		return
110110 	fi
111111 
112
-	# Go through each of the object's symbols which match the func name.
113
-	# In rare cases there might be duplicates.
114
-	file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
115
-	while read symbol; do
116
-		local fields=($symbol)
117
-		local sym_base=0x${fields[0]}
118
-		local sym_type=${fields[1]}
119
-		local sym_end=${fields[3]}
112
+	# vmlinux uses absolute addresses in the section table rather than
113
+	# section offsets.
114
+	local file_type=$(${READELF} --file-header $objfile |
115
+		${AWK} '$1 == "Type:" { print $2; exit }')
116
+	if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
117
+		is_vmlinux=1
118
+	fi
120119 
121
-		# calculate the size
122
-		local sym_size=$(($sym_end - $sym_base))
123
-		if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
124
-			warn "bad symbol size: base: $sym_base end: $sym_end"
120
+	# Go through each of the object's symbols which match the func name.
121
+	# In rare cases there might be duplicates, in which case we print all
122
+	# matches.
123
+	while read line; do
124
+		local fields=($line)
125
+		local sym_addr=0x${fields[1]}
126
+		local sym_elf_size=${fields[2]}
127
+		local sym_sec=${fields[6]}
128
+		local sec_size
129
+		local sec_name
130
+
131
+		# Get the section size:
132
+		sec_size=$(${READELF} --section-headers --wide $objfile |
133
+			sed 's/\[ /\[/' |
134
+			${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }')
135
+
136
+		if [[ -z $sec_size ]]; then
137
+			warn "bad section size: section: $sym_sec"
125138 			DONE=1
126139 			return
127140 		fi
141
+
142
+		# Get the section name:
143
+		sec_name=$(${READELF} --section-headers --wide $objfile |
144
+			sed 's/\[ /\[/' |
145
+			${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }')
146
+
147
+		if [[ -z $sec_name ]]; then
148
+			warn "bad section name: section: $sym_sec"
149
+			DONE=1
150
+			return
151
+		fi
152
+
153
+		# Calculate the symbol size.
154
+		#
155
+		# Unfortunately we can't use the ELF size, because kallsyms
156
+		# also includes the padding bytes in its size calculation.  For
157
+		# kallsyms, the size calculation is the distance between the
158
+		# symbol and the next symbol in a sorted list.
159
+		local sym_size
160
+		local cur_sym_addr
161
+		local found=0
162
+		while read line; do
163
+			local fields=($line)
164
+			cur_sym_addr=0x${fields[1]}
165
+			local cur_sym_elf_size=${fields[2]}
166
+			local cur_sym_name=${fields[7]:-}
167
+
168
+			if [[ $cur_sym_addr = $sym_addr ]] &&
169
+			   [[ $cur_sym_elf_size = $sym_elf_size ]] &&
170
+			   [[ $cur_sym_name = $sym_name ]]; then
171
+				found=1
172
+				continue
173
+			fi
174
+
175
+			if [[ $found = 1 ]]; then
176
+				sym_size=$(($cur_sym_addr - $sym_addr))
177
+				[[ $sym_size -lt $sym_elf_size ]] && continue;
178
+				found=2
179
+				break
180
+			fi
181
+		done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2)
182
+
183
+		if [[ $found = 0 ]]; then
184
+			warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"
185
+			DONE=1
186
+			return
187
+		fi
188
+
189
+		# If nothing was found after the symbol, assume it's the last
190
+		# symbol in the section.
191
+		[[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr))
192
+
193
+		if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
194
+			warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"
195
+			DONE=1
196
+			return
197
+		fi
198
+
128199 		sym_size=0x$(printf %x $sym_size)
129200 
130
-		# calculate the address
131
-		local addr=$(($sym_base + $offset))
201
+		# Calculate the address from user-supplied offset:
202
+		local addr=$(($sym_addr + $func_offset))
132203 		if [[ -z $addr ]] || [[ $addr = 0 ]]; then
133
-			warn "bad address: $sym_base + $offset"
204
+			warn "bad address: $sym_addr + $func_offset"
134205 			DONE=1
135206 			return
136207 		fi
137208 		addr=0x$(printf %x $addr)
138209 
139
-		# weed out non-function symbols
140
-		if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then
210
+		# If the user provided a size, make sure it matches the symbol's size:
211
+		if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then
141212 			[[ $print_warnings = 1 ]] &&
142
-				echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"
143
-			continue
144
-		fi
145
-
146
-		# if the user provided a size, make sure it matches the symbol's size
147
-		if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
148
-			[[ $print_warnings = 1 ]] &&
149
-				echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"
213
+				echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)"
150214 			continue;
151215 		fi
152216 
153
-		# make sure the provided offset is within the symbol's range
154
-		if [[ $offset -gt $sym_size ]]; then
217
+		# Make sure the provided offset is within the symbol's range:
218
+		if [[ $func_offset -gt $sym_size ]]; then
155219 			[[ $print_warnings = 1 ]] &&
156
-				echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"
220
+				echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"
157221 			continue
158222 		fi
159223 
160
-		# separate multiple entries with a blank line
224
+		# In case of duplicates or multiple addresses specified on the
225
+		# cmdline, separate multiple entries with a blank line:
161226 		[[ $FIRST = 0 ]] && echo
162227 		FIRST=0
163228 
164
-		# pass real address to addr2line
165
-		echo "$func+$offset/$sym_size:"
166
-		local file_lines=$(${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;")
167
-		[[ -z $file_lines ]] && return
229
+		echo "$sym_name+$func_offset/$sym_size:"
168230 
231
+		# Pass section address to addr2line and strip absolute paths
232
+		# from the output:
233
+		local args="--functions --pretty-print --inlines --exe=$objfile"
234
+		[[ $is_vmlinux = 0 ]] && args="$args --section=$sec_name"
235
+		local output=$(${ADDR2LINE} $args $addr | sed "s; $dir_prefix\(\./\)*; ;")
236
+		[[ -z $output ]] && continue
237
+
238
+		# Default output (non --list):
169239 		if [[ $LIST = 0 ]]; then
170
-			echo "$file_lines" | while read -r line
240
+			echo "$output" | while read -r line
171241 			do
172242 				echo $line
173243 			done
174244 			DONE=1;
175
-			return
245
+			continue
176246 		fi
177247 
178
-		# show each line with context
179
-		echo "$file_lines" | while read -r line
248
+		# For --list, show each line with its corresponding source code:
249
+		echo "$output" | while read -r line
180250 		do
181251 			echo
182252 			echo $line
....@@ -184,12 +254,12 @@
184254 			n1=$[$n-5]
185255 			n2=$[$n+5]
186256 			f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g')
187
-			awk 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
257
+			${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
188258 		done
189259 
190260 		DONE=1
191261 
192
-	done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')
262
+	done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$4 == "FUNC" && $8 == fn')
193263 }
194264 
195265 [[ $# -lt 2 ]] && usage